On Wed, Feb 22, 2017 at 04:01:05PM +0000, Matthew Auld wrote:
> For our fake dma objects we can leak the underlying gem object if we
> fail to pin our "backing storage".
>
> [ 39.952618] =============================================================================
> [ 39.952625] BUG mock_object (Tainted: G U ): Objects remaining in mock_object on __kmem_cache_shutdown()
> [ 39.952629] -----------------------------------------------------------------------------
>
> [ 39.952633] Disabling lock debugging due to kernel taint
> [ 39.952635] INFO: Slab 0xffffea00086c6a00 objects=21 used=1 fp=0xffff88021b1abc00 flags=0x5fff8000008100
> [ 39.952640] CPU: 1 PID: 1258 Comm: drv_selftest Tainted: G BU 4.10.0+ #46
> [ 39.952641] Hardware name: Apple Inc. MacBookPro11,1/Mac-189A3D4F975D5FFC, BIOS MBP111.88Z.0138.B17.1602221718 02/22/2016
> [ 39.952642] Call Trace:
> [ 39.952648] dump_stack+0x4d/0x6f
> [ 39.952651] slab_err+0x9d/0xb0
> [ 39.952654] ? ksm_migrate_page+0xe0/0xe0
> [ 39.952657] ? on_each_cpu_cond+0x9a/0xc0
> [ 39.952658] ? __kmalloc+0x1af/0x1c0
> [ 39.952660] ? __kmem_cache_shutdown+0x173/0x3e0
> [ 39.952661] __kmem_cache_shutdown+0x196/0x3e0
> [ 39.952664] kmem_cache_destroy+0xa0/0x150
> [ 39.952708] mock_device_release+0x113/0x140 [i915]
> [ 39.952726] drm_dev_release+0x20/0x40 [drm]
> [ 39.952735] drm_dev_unref+0x23/0x30 [drm]
> [ 39.952768] i915_gem_gtt_mock_selftests+0x55/0x70 [i915]
> [ 39.952803] __run_selftests+0x169/0x1c0 [i915]
> [ 39.952805] ? 0xffffffffa0151000
> [ 39.952840] i915_mock_selftests+0x30/0x60 [i915]
> [ 39.952869] i915_init+0xc/0x78 [i915]
> [ 39.952870] ? 0xffffffffa0151000
> [ 39.952872] do_one_initcall+0x43/0x170
> [ 39.952874] ? __vunmap+0x81/0xd0
> [ 39.952875] ? kmem_cache_alloc_trace+0x37/0x170
> [ 39.952877] ? do_init_module+0x27/0x1f8
> [ 39.952879] do_init_module+0x5f/0x1f8
> [ 39.952881] load_module+0x2423/0x29b0
> [ 39.952882] ? __symbol_put+0x40/0x40
> [ 39.952885] ? kernel_read_file+0x1a3/0x1c0
> [ 39.952887] SYSC_finit_module+0xbc/0xf0
> [ 39.952889] SyS_finit_module+0xe/0x10
> [ 39.952892] entry_SYSCALL_64_fastpath+0x13/0x94
>
> v2: use onion teardown and favour i915_gem_object_put
>
> Fixes: 8d28ba4568f4 ("drm/i915: Exercise filling the top/bottom portions of the ppgtt")
> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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